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The Boostmonster! - 300mm Frankenbike - Worlds Greatest DH Bike?

May 11, 2022 at 17:12
by Jordan Boostmaster  

As the Bike industry goes longer lower slacker, I am going higher, heavier and sendier.

This bike has been a big project I have been working on for quite a while now perfecting and tuning up to my liking.
The 'Boostmonster' is a frankenbike that features a 2005 Norco A-line frame and a 2003 Marzocchi Supermonster 300mm fork.
I also put a larger 10.5x3.5 shock onto it to add to the rear travel, (stock is 9.5x3.0) the rear travel is now about 279mm.

Boostmonster Geometry:
BB height: 423mm
Wheelbase: 1228mm
Front centre: 794mm
Chainstay length: 435mm
Reach: 365mm
Stack: 637mm
RAD: 835mm
64.5 degree headtube angle

Weight 49lbs

The use of the 2005 Norco A-line was not my original idea, I have been talking with bipolarexpress a lot in getting advice on this build, you may have seen some of his articles here in the past.

Finally all done Norco A-Line Marzocchi Super Monster Seismic Industries Hubs Shimano Airlines Azonic Love Seat Grimeca System 17. It s been some years of crazy hucking.
I am basically copying him with this idea, but I am coming at this build from a bit of a different angle, I am not as concerned with keeping it oldschool, but rather squeezing every last bit of performance out of this supermonster, so I am putting all my favorite modern components on here.

I am going with 26" wheels for now, but will also try a 24" wheelset soon and really see what I like best for this build.

The 2003 Marzocchi Supermonster is the star of the show

Chromag OSX LTD polished handlebar, Hope Tech 3 V4 brakes, ODI grips with custom engraved lizard skin rings, Chris King headset

Saint Drivetrain 7 speed, hope pro 4 hubs laced to DT Swiss FR 560 rims, STFU system

Stock Truvativ cranks with Straitline pedals and bashguard

shuttling at Vedder
I currently have a Fox Van R rear shock and I fit on a 500lb spring. Schwalbe Magic Mary tires (tubeless front, tube rear)

I hired Andrextr to analyse the bike so I could understand how the rear suspension works.

The blue Line in the progression image represents the 9" travel position, and the orange line shows the 8" travel position

We added more rearward wheel movement with the longer shock, which also made the chainstay length a bit shorter


Last year I started this build with a beautiful stock 2005 Norco A-line, see that video here:

It was really fun on Jolly Rancher at Bear mtn, this bike needs really gnarliest trails and big hits!

The Boostmonster

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You can support what I'm doing on Patreon

Author Info:
boostmaster avatar

Member since Mar 8, 2008
46 articles

  • 2 0
 This is such a sick bike! Would love to ride it
  • 1 0
 you need a float x2 in 10.5x3.5.

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